A5085557676- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Soil and Water Nutrient Dynamics
- High-Energy Particle Collisions Research
- Soil Carbon and Nitrogen Dynamics
- Ruminant Nutrition and Digestive Physiology
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Soil erosion and sediment transport
- Phosphorus and nutrient management
- Quantum, superfluid, helium dynamics
- Pasture and Agricultural Systems
- Hydrology and Watershed Management Studies
- Agronomic Practices and Intercropping Systems
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Banana Cultivation and Research
- Advanced Chemical Physics Studies
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Advanced NMR Techniques and Applications
- Neutrino Physics Research
- Agroforestry and silvopastoral systems
- Wastewater Treatment and Reuse
AgResearch
2012-2024
University of Virginia
2004-2022
Cargill (Netherlands)
1992-2012
Thomas Jefferson National Accelerator Facility
2003-2008
Campbell Collaboration
2001-2007
University of America
2007
Catholic University of America
2007
Massachusetts Institute of Technology
2004-2007
University of Giessen
2005-2007
University of California, Los Angeles
2005-2007
We present results on the electroexcitation of low mass resonances Delta(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 in a wide range Q2. The were obtained comprehensive analysis JLab-CLAS data differential cross sections, longitudinally polarized beam asymmetries, longitudinal target beam-target asymmetries for pion electroproduction off proton. analysed using two conceptually different approaches, fixed-t dispersion relations unitary isobar model, allowing us to draw conclusions model...
We report on a high-statistics measurement of the deuteron spin structure function ${g}_{1}^{d}$ at beam energy 29 GeV in kinematic range $0.029<x<0.8$ and $1<{Q}^{2}<10$ (GeV $/c$${)}^{2}$. The integral ${\ensuremath{\gamma}}_{1}^{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\int}{1}^{}{g}_{1}^{d}\mathrm{dx}$ evaluated fixed ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3$ $/c$${)}^{2}$ gives...
Abstract The effects of increasing nitrogen (N) fertiliser inputs, and associated cattle stocking rates, on pasture yield composition, soil physical quality nutrient losses in drainage were measured an experiment permanent white clover/ryegrass pastures eastern Southland, New Zealand. Treatments established hydrologically‐isolated replicate plots (900 m2) where received annual N inputs 0, 100, 200 or 400 kg ha–1 grazed throughout spring, summer, autumn each year by non‐lactating dairy...
We report a new measurement of the exclusive electroproduction reaction ${\ensuremath{\gamma}}^{*}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}p$ to explore evolution from soft nonperturbative physics hard processes via ${Q}^{2}$ dependence magnetic (${M}_{1+}$), electric (${E}_{1+}$), and scalar (${S}_{1+}$) multipoles in $N\ensuremath{\rightarrow}\ensuremath{\Delta}$ transition. 9000 differential cross section data points cover $W$ threshold $1.4\text{ }\text{ }\mathrm{GeV}/{c}^{2}$,...
The electromagnetic pion production reactions are investigated within the dynamical coupled-channels model developed by Matsuyama, Sato, and Lee [Phys. Rep. 439, 193 (2007)]. meson-baryon channels included in this study $\ensuremath{\gamma}N,\ensuremath{\pi}N,\ensuremath{\eta}N$, $\ensuremath{\pi}\ensuremath{\Delta},\ensuremath{\rho}N$, $\ensuremath{\sigma}N$ resonant components of $\ensuremath{\pi}\ensuremath{\pi}N$ channel. With hadronic parameters determined a recent $\ensuremath{\pi}N$...
Abstract The effectiveness of a granular formulation dicyandiamide (DCD) in limiting nitrate leaching from grazed dairy pasture southern New Zealand is reported. Treatments were an untreated Control managed as standard farm practice, and+DCD with two or three applications DCD per annum at rate 10 kg active ingredient (a.i.) ha‐1 application. Each treatment had hydrologically‐isolated plots 12 m wide × 15m long separate mole‐pipe drainage systems which waters collected and analysed for...
The ratio g1F1 has been measured over the range 0.03 < x 0.6 and 0.3 Q2 10 (GeV/c)2 using deep-inelastic scattering of polarized electrons from protons deuterons. We find to be consistent with no Q2-dependence at fixed in region > 1 (GeV/c)2. A trend is observed for decrease lower Q2. Fits world data without a possible are agreement Bjorken sum rule, but Δq substantially less than quark-parton model expectation.
The quasielastic ${(e,e}^{\ensuremath{'}}p)$ reaction was studied on targets of deuterium, carbon, and iron up to a value momentum transfer ${Q}^{2}$ $8.1(\mathrm{GeV}{/c)}^{2}.$ A nuclear transparency determined by comparing the data calculations in plane-wave impulse approximation. dependence mass number investigated search for onset color phenomenon. We find no evidence within our range ${Q}^{2}.$ fit world's reflects energy free-proton--nucleon cross section.
Abstract To evaluate the role of artificial drainage systems in transfer nutrients and faecal organisms from soil to waterways, mole‐pipe flows were monitored two large (27 × 40 m), hydrologically isolated field plots that part a long‐term dairy pasture West Otago, New Zealand. One plot was grazed only whilst other spray irrigated with untreated dairy‐shed effluent on seven occasions, shortly following grazing events spring, summer or autumn. Monitoring throughout 4‐year study showed...
In New Zealand the primary sector together with central and local government agencies have been promoting measures to mitigate adverse effect of farming practices on water quality over last few decades. We assessed effectiveness some key such as stock exclusion, riparian protection, nutrient effluent management reducing losses nitrogen (N), phosphorus (P) sediment water. Our aim was determine how much progress has made in decreasing contaminant discharges between 1995 2015 what loads would...
To meet the water quality outcomes sought by catchment communities and regulators, losses of nitrogen (N), phosphorus (P) sediment from dairy sheep/beef farms must be reduced across many catchments. We conducted a high-level desktop analysis farm typologies established that if mitigation actions were fully implemented farms, N P could have been decreased up to 16 23%, respectively, compared estimated for 2015 (where only partially implemented). Potential decreases greater land (34% 26% P)...
Inclusive electron-scattering cross sections have been measured for $^{56}\mathrm{Fe}$ in the quasielastic region at electron energies between 0.9 and 4.3 GeV, scattering angles of 15\ifmmode^\circ\else\textdegree\fi{} 85\ifmmode^\circ\else\textdegree\fi{}. Longitudinal transverse response functions a q 1.14 GeV/c extracted using Rosenbluth separation. The experimental Coulomb sum has obtained with aid an extrapolation. longitudinal function, after correction distortion, is lower than...
Abstract The trial reported here investigated the effect of applying dicyandiamide (DCD) in a granular form on N2O emissions grazed pasture system over 2 years. In 2004, treatments urea or + zeolite‐DCD were applied randomly to pairs plots following grazing late autumn. Both received at rate 50 kg N ha‐1, while latter treatment also included an application zeolite/DCD 42 ha‐1 (DCn™: 10 DCD). 2005, same early and autumn spring. Measurements made frequent intervals using standardised soil...
Abstract intensive dairy cattle grazing on wet soil can have a detrimental effect physical quality and consequently pasture production. Soil properties (porosity, bulk density, saturated hydraulic conductivity) of Pallic (Pukemutu silt loam) production were assessed farm in Southland, New Zealand, under number different strategies: (i) normal management undrained land, (ii) practice drained (iii) restricted autumn grazing, (iv) when conditions wet, (v) never pugged, (vi) grazed. hand‐pushed...
Abstract In response to local concerns about the off‐site impacts of intensive cattle grazing on surface water quality, a field study was conducted quantify N and P losses in overland flow from cattle‐grazed pasture eastern Southland. Overland drained undrained areas silt loam soil collected over 3‐year period using guttering system connected 0.5‐litre tipping buckets for recording volumes. Results indicated that total between two seven times greater than soil. Losses soils were low relative...
The reaction $^{3}\mathrm{He}$(${\ensuremath{\pi}}^{+}$,pp)p was measured at ${T}_{\ensuremath{\pi}}$=350 and 500 MeV in a kinematically complete experiment. Separate contributions from two-body three-body pion absorption are clearly seen recoil momentum distributions. angular distributions closely follow the shape of free \ensuremath{\pi}d\ensuremath{\rightarrow}pp cross section, although number deuterons estimated yield is larger than value 1.5 expected isospin coupling observed previously...
A study was conducted in Southland, New Zealand to: (i) measure nitrous oxide (N2O) emissions and nitrate (NO3–-N) leaching losses from a cattle-grazed, winter forage crop; (ii) quantify the effect of dicyandiamide (DCD) reducing these losses. Drainage were measured for 12 months (December 2005–November 2006) December-sown kale crop using hydrologically isolated drainage plots at Woodlands Research Station. N2O 6 (June–November) following simulated grazing mid-June. bare ground amounted to...